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/**
* Copyright 2012 Kjetil Ørbekk <kjetil.orbekk@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.orbekk.same;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.UnknownHostException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.FutureTask;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.orbekk.protobuf.RpcChannel;
public class ConnectionManagerImpl implements ConnectionManager {
private int connectionTimeout;
private int readTimeout;
private ConcurrentMap<String, Future<RpcChannel>> channels =
new ConcurrentHashMap<String, Future<RpcChannel>>();
private Logger logger = LoggerFactory.getLogger(getClass());
/**
* @param connectionTimout Timeout for establishing connection in milliseconds.
* @param readTimeout Timeout for waiting for answer in milliseconds.
*/
public ConnectionManagerImpl(int connectionTimout, int readTimeout) {
this.connectionTimeout = connectionTimout;
this.readTimeout = readTimeout;
}
private boolean isValidLocation(String location) {
String[] args = location.split(":");
if (args.length != 2) {
logger.error("Invalid location: " + location);
return false;
}
try {
Integer.valueOf(args[1]);
} catch (IllegalArgumentException e) {
logger.error("Invalid location: " + location);
return false;
}
return true;
}
private RpcChannel getChannel(String location) {
Future<RpcChannel> channel = channels.get(location);
if (channel == null) {
if (!isValidLocation(location)) {
return null;
}
String[] args = location.split(":");
final String hostname = args[0];
final int port = Integer.valueOf(args[1]);
Callable<RpcChannel> channelFactory =
new Callable<RpcChannel>() {
@Override public RpcChannel call() {
try {
return RpcChannel.create(hostname, port);
} catch (UnknownHostException e) {
logger.error("Could not connect: ", e);
return null;
} catch (IOException e) {
logger.error("Could not connect: ", e);
return null;
}
}
};
FutureTask<RpcChannel> task =
new FutureTask<RpcChannel>(channelFactory);
channel = channels.putIfAbsent(location, task);
if (channel == null) {
task.run();
channel = task;
}
}
try {
return channel.get();
} catch (ExecutionException e) {
logger.error("Could not connect: ", e);
return null;
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
return null;
}
}
@Override
public Services.Master getMaster0(String location) {
RpcChannel channel = getChannel(location);
if (channel != null) {
return Services.Master.newStub(channel);
} else {
return null;
}
}
@Override
public Services.Client getClient0(String location) {
RpcChannel channel = getChannel(location);
if (channel != null) {
return Services.Client.newStub(channel);
} else {
return null;
}
}
@Override
public Services.Directory getDirectory(String location) {
RpcChannel channel = getChannel(location);
if (channel != null) {
return Services.Directory.newStub(channel);
} else {
return null;
}
}
@Override
public Services.Paxos getPaxos0(String location) {
RpcChannel channel = getChannel(location);
if (channel != null) {
return Services.Paxos.newStub(channel);
} else {
return null;
}
}
}
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